I really do think that this boring Overlord installment can set up an exciting third game, though. Imagine this:
Your the son of one of the three mistresses, you have two other brothers. You've inherited a twisted, demonic visage from your father and from your mother (one of the three) you've inherited a unique advantage.
If you're the son of the strong mistress, you're basically a fighter and you are weaker at spell casting and you are slower in speed.
You make minions from the souls of the dead, classic style. They're strong and fast, but can't take much of a beating.
If you're the son of the manipulative mistress, you're better at controlling minions and more easily able to manage greater numbers of them, as well as manipulating people, but you're physically frail, though fast.
Your minions are people, enslaved with your charismatic powers and bewitched by your handsome appearance. To gain these minions, you must break their wills by staring them down, it is possible to send them back to your tower like classic minions, they just need bigger spawn points.
If you're the son of the magical mistress, you're better at magic and gain access to unique spells and powers, at the cost of being physically frail and unskilled in physical combat.
Your minions are zombies, your dead enemies fill your ranks. Zombies are exceptionally slower than the other minions, but they are strong and durable and easy to replace, though they are not smart enough to use weapons.
Raised from birth to be obedient to your father, you and your brothers break free from his control at age 18 and because of your upbringing as servants, essentially, desire great power.
Namely, control of your father's domain and his death.
A great open world with unique options depending on your character and distinct differences between each playable character's abilities, minions, actions, appearance, domains and options.
I can only dream...